Glower-supporting plug for electric lamps.



No. 672,607. A P Patented Apr. 23, MW. .1. VAN VLECK & w. N. STEVENS.

GLOWEB SUPPORTING PLUG FUR ELECTRIC LAMPS. (Application filed Ayr. 27, 1900 (No Model.) 2 Sheets-Sheet W/ TNE SSE S IN VE N 70!? J P I J zm z I L (i/llto No. 672,607. Patented Apr. 23, l90l. J. VAN VLECK & W. N. STEVENS. GLOWER SUPPORTING PLUG FOR ELECTRIC LAMPS.

I (Application filed Apr. 27, 1900.; (no Mode") 2 Sheets$heet2.

INVENTOR 5 M m [7 mm M @WITNESSES:

ATTORNEY m: Noam: wzrsns co. mom-Lima, WASHINGTON. b, c.

UNIT D STATES PATENT FFICE.

JOHN VAN .VLECK AND WILLIAM N. STEVENS, OF NEW YORK, N. Y.

GLOWER-SUPPORTING PLUG FOR ELECTRIC LAMPS.

SPECIFICATION formingpart of Letters Patent No.- 672,607, dated April 23, 1901. Application filed April 27, 1900. Serial No. 14,523. We model.)

To. ctZZ whom it mtty concern:

.Beitknown that we, JOHN VAN VLECK and 1 WILLIAM N. STEVENS, of the city of New York, State of New York, have invented a new and useful Improvement in Glower-SupportingfPlugs for Electric Lamps, of which f the following is a specification. Our invention relates to that type of electrio lamp in which there is a glower'normally he non-conducting, but which becomes conducting andcaused to glowupon being raised to f a certain temperature. \Our invention consists more particularly in the glower-supporting plug of non-conduct 1 315 ing material having a glower permanently s jqsecured upon one face thereof and provided withcircuit connections for said glower, the sameforming in its entirety a new article of manufacture and sale, and also in the con- :go struction of said plug, as more particularly I I pointed out in the claims.

In the accompanying drawings, Figure 1 is a verticalcross-section of our improved H I glower-supporting plug. Fig. 2 is a side elef vation showing also a modification in which the reflecting-surface is made conical or convex instead of concave, as shown in Fig. 1. p, Fig; 3 is a vertical cross-section showing a .go made curved to conform to the concavity of its support.

:Similar letters of reference indicate like parts.

fractory material,is supported in any suitable way in front of the reflecting-surface O, and

,qwhen said surface is concave, as shown in Fig.1, said glower is disposed wholly within c said concavity. One circuit-wire a is connected to the contact-plate D and to one end 650 of the glower. The other circuit-wire b is modification of Fig. 1, wherein the glower is A represents a'body of non-conducting ma connected to the other end of the glower and to the metal shell B. It will be readily understood that this arrangement provides for a current passing from the sourceof electricity to the main contact-plate D,to circuitwire a, to the glower E, circuit-wire b, metal shell B, and so to the return-conductor.

The construction shown in Fig. 1 we regard as preferable, because there are no projecting parts liable to break off.

In the modification shown in Fig. 2 the 1 lower face of the plug A is made conical or convex and the glower is supported below the apex of the same by its circuit-wires, as shown. The glower may be bent or curved, as shown in Fig. 2, to correspond to the form of the reflecting-surface. This arrangement obviously permits the light rays from the glower to be distributed over the larger por-j tion of the sphere of illumination. In either case, however, the surface of the convexity or concavity acts as a reflector for the light, and if of plaster it may be left white, or, if desired, it may be suitably silver-ed.

The object of making the lower portion F of the body A of larger diameter than the upper portion is to afford a larger reflectingsurface and to permit of the whole glower being placed within the concavity when said reflecting-surface is concave, as shown in Fig. '1.

We claim- 1. As a new article of manufacture, a cy- :lindrical plug of insulating material having at one end a circular facefa glower supported upon said plug in proximity to said face, and contact-pieces on said plug electrically connected to said glower, substantially as described.

2. As a new article of manufacture, a cylindrical plug of insulating material having at one end a concave circular face, a glower supported upon said plug in proximity to said face and contact-pieces on said plug electrically connected to said glower, substantially as described.

3. A glower-supporting plug for electric glower-lamps having an interior body of nonconducting material, an inclosing metallic shell threaded on its periphery, a curved or inclined reflecting lower portion and a glower I l I 672,607

supported i'n' front of said reflecting lower portion, and circuit connections, substantially as described.

shell threaded on its periphery, arefiecting concavity in its lower portion, a glowersupported on' said plug and wholly within said 'tially as described 7 v p H 5. A glower-supporting plug for electric glower-lamps having in its. lower portion a concavity and aglower supported wholly Within v said concavity, substantially as de- ,6 .f A glower-supporting plug. for electric glower-lam'psxharing a cylindrical body of' non-conducting material, of enlarged diameter at one end, an -inclosing metallic shell threadedon its periphery along its portion of t slnaller'diametena curved or'inclinedreflectingxportion onthe f ac'eof largerdian eter of contact-plates on the cute substantially as described.

said body and aglo wer supported on said plug V and'in'frontof said reflecting portion, substantially as described.

7. A glower-supporting plug for electric I glower-lamps having at its lower portion a clirved or inclined reflecting-surface and a glower supported in front of said surface and bent or curved in substantial correspondence thereto, substantially as described; concavity, and circuit connections, substan- ,8. gloWer-supporting plug for electric glower-lamps of non-conducting material,

*means for detachably connectingvs'aid plug to a lamp or fixture, and a glower supported on one face of said plug, and circuit connections for said glower embedded in thesubstance of said plug. and s'ecu'red to metallic r surfacethereof,

JOHN VAN .VLECKL 'WILLIAM N. STEVENS; Witnesses: l i a H. R. MoLLER,

WM. H. SIEGMAN. 

